Photographic shutter.



PATENTED DEG.12, 1905.

M. BERGER.

PHOTOGRAPHIC SHUTTER.

APPLICATION FILED APR.26.1904.

2 SHEETS-SHEET 1.

WWA? dyes 2 SHEETS-SHEET 2.

PATENTBD DEG.12, i905.

M. BERGER., PHOTOGRAPHIG SHTTER.

APPLICATION FILED APR.26.1904.

TED PATENT (')FFICE MAX BERGER, OF JENA, GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS, OF JENA, SAXE-VVEIMAR, GERMANY.

PHOTOGRAPHIC SH UTTER.

Patented Dec. 12, 1905.

Application iiled April 26, 1904. Serial No. 205,081.

To LZ-Z whom, t wha/y concern/.-

Be it-known that l, Mnx BERGER, engineer, a citizen of the Kingdom of Saxony, residing at Carl Zeiss strasse, Jena, in the Grand Duchy of Saxe-Weimar, German Empire, have invented a new and useful Photographic Shutter, of which the following is a speciiication.

The object of the present invention is to improve that kind of double roller-blind safety-shutters with adjustable height of the exposing-slit, a special construction of which has been shown and described in the Patent No. 709,079.

ln the accompanying drawings, Figure l is a front view of awinding and adjusting mechanism constructed according to the invention for double rollereblind safety-shutters. Fig. 2 is a side view of the same. Fig. 3 is a section on the line 3 3 in Fig. l. Fig 4 is a front view of a similar mechanism. Fig. 5 is a side view of the same. Fig. 6 is a section on the line 6 6 in Fig. 4.

In both examples the mechanism is shown in a position which may be attained by tale ing hold of the handle of the driving-wheel of the upper blind, turning itin the direction of the arrow, and thus bringing the slit in its existing adjustment before the exposure-aperture.

When the shutter mechanism shown in Figs. l to is run down, the position of. the upper and lower blinds relatively to each other is such as to have the-slit covered, so that in winding both blinds may run up simultaneously. On completion of the winding the lower blind a drops back as required to produce the height of slit as adjusted, so that both blinds are ready to commence simultaneously running down for exposure. Finally, at the finish of the exposure drop the upper blind b falls by a suflicient additional amount to cover the slit again. These functional requirements are met by the following means The driving-wheel c of the lower blind a is rigidly connected with a shaft j ournaled in the camera-frame d and marked e, as well as with the winding-head j Between this head and the wheel c on the hub of the latter the driving-wheel g of the upper blind b is rotatably mounted. As the shutter runs down the pin h, which is screwed into the frame d, intercepts the driving-wheel c of the lower blind a, for which purpose this wheel is provided with a shoulder t. The square stop 7c extends from wheel c into the space between wheels c and g and, in con junction with stops Z and m of the drivingwheel g of the upper blind l), iixes the limit of the movement of the blinds in relation to each other. Stop m serves to regulate the height of the slit. lt is provided with a winged head to facilitate its being changed from one of the holes n (of which in this instance there are assumed to be three) to another, according to the height of slit selected. A spring 0, rotatable on the hub of wheel c, extends with its forked free end over the flange of stop m, so that the latter cannot r drop out. The check and release appliance acts upon the driving-wheel g of the upper blind I). lt consists of a tooth p, provided on that wheel, and a pawl q, attached to the cameraeframe and controlled by a spring.

A knob 'r is Afitted to wheel g, and by its means the shutter mechanism can be brought to the position shown, in which the height of the slit as adjusted can be examined within the exposure-aperture. The stop m is lfurthermore provided with a transverse slit (see Fig. 2) on its operative end, but is square at its neck, where itis inclosed by the spring o. After lifting spring o, so as to disengage it from the square portion of stop fm the latter can be rotated by ninety degrees and then secured against further rotation by releasing the spring again. When wheel g is now turned in the direction of the arrow, stop m no longer carries the narrow stop k along with it, but allows it to pass through the transverse slit. T he lower blind thus remains in its lowered position, while the upper. blind can be passed completely over the exposure-aperture, whereafter the pawl g catches the tooth p. To restore the original condition of the winding appliance, the upper blind may be allowed to run down and the stop m turned again by ninety degrees.

ln the example illustrated by Figs. 4 to 6 the invention has been applied to a mechanism by means of which the slit is not only already covered in the run-down position, as in theiirst example, but also remains so in the woundup position of the shutter, while after releasing the latter the lower blind 'first begins to run down and is not followed by the upper blind until the adjusted height of slit has been produced. For this succession of IOO , head f of the recesses n.

movements of the blinds the following means the necessity of drawing the button outward are devised: In a bush. t, journaled in the fixed frame d, the shaft e is non-rotatably fastened by means of the pin s, while the same pin secures the driving-wheel g of the upper blind l) to the bush Thus wheel g also is connected with shaft e', so as to be incapable of independent rotation. On the shaft e is loosely mounted the driving-wheel c of the lower blind a, carrying a winding- Ihile the shutter is ruiming down, a pin h', fitted to frame d, arrests the movement of wheel c by the tooth u of the latter coming in contact with the pin. The same tooth u, conjointly with the pawl i), forms the check and release action of wheel c and serves in addition as one of the two stops of wheel c', which, in conjunction with stop fw of wheel g, define the limit of movement of the two blinds in relation to each other. The second stop fm serves at the same time for regulating the height of the slit and is for that purpose fitted rotatably on the hub of wheel c. Its middle part forms a flat spring, so that its extremity may be set into any one v vvhe check action of driving-wheel g of the upper blind is supplied by its tooth p/ acting in combination with the pawl g. In order to release wheel g during the running down of the shutter immediately the slit has been opened out to the required height by virtue of the movement in advance of the lower blind a, the pawl Q has an inclined surface on its free extremity which projects into the path of the outer end of stop m, so as to be pushed back by the latter and disengaged from tooth p.

For the purpose of adapting the invention to the arrangement just described the shaft e with which wheel g is rigidly connected, is fitted with a button-shaped handle r. By turning this button in the direction of winding indicated by the arrow in Fig. 4 the whole apparatus can be brought to the position shown in the drawings, the slit then being visible in the exposure-aperture in the height to which it had previously been adjusted. In order that it may be possible to raise the upper blind separately, the shaft e', controlled by a spring x, is made shiftable on the pin s by means of the slit y and in addition is reduced at the point where it carries wheel c. Thus while wheel g is unable to undergo axial displacement, owing to its rigid connection with bush t, wheel c may be withdrawn by means of button r till its stop m no longer obstructs the path of the stop w of wheel g. If button r then be rotated in the direction of the arrow till the pawl Q/ has caught up tooth p', the upper blind is completely drawn up. If hereafter the lower blind is to be raised also, (by rotation of the winding-button f the stop m may be again carried clear of stop w by simultaneously drawing button f outward. To obviate in the latter case while rotating it and to enable the upper blind after being wound separately to freely run down when pawl g is released, the back of stop m should be sloping, as shown at z in Fig. 6, so that this `stop is displaced by stop w acting upon the sloping surface of stop m.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a double roller-blind safety-shutter the two blinds of which are independent of each other and confine the exposure-slit, the combination, with two toothed wheels arranged coaxially and controlling one the upper and the other the lower blind, of a set of stops on these wheels adapted to engage each other so as to limit the rotation of the wheels relatively to each other, one of the stops being adjustable for adjusting the height of slit, a winding-head on the wheel controlling the lower blind, means releasably checking the shutter after it has been wound, and a han- (lle on the wheel controlling the upper blind, essentially as and for the purpose set forth.

2. In a double roller-blind safety-shutter the two blinds of which are independent of each other and confine the exposure-slit, the combination, with two toothed wheels arranged coaxially and controlling one the upper and the other the lower blind, of a set of stops on these wheels adapted to engage each other so as to limit the rotation of the wheels relatively to each other, one of the stops being adjustable for adjusting the height of slit, a winding-head on the wheel controlling the lower blind, means releasably checking the shutter'after it has been wound, a handle on the wheel controlling the upper blind, and means for disengaging the stops, essentially as and for the purpose set. forth.

3. In a double roller-blind safety-shutter the two blinds of which are independent of each other and confine the ex'aosure-slit, the combination, with two toot led wheels arranged coaxially and controlling one the upper and the other the lower blind, of a set of stops on these wheels adapted to engage each other so as to limit the rotation of the wheels relatively to each other, one of the stops being adjustable for adjusting the height of slit, a windingehead on the wheel controlling the lower blind, means for releasably checking the shutter after it has been wound, a handle on the wheel controlling the upper blind, means for extending the axial distance between the two wheels, and a spring counteracting such extension, essentially as and for the purpose set forth.

4. In a double roller-blind safety-shutter the two blinds of which are independent of each other and coniine the exposure-slit, the combination, with two toothed wheels arranged coaxially and controlling one the upper and the other the lower blind, of a set of stops on these wheels consisting of one stop IOO ISO

Io lease the wheel of the upper blind, and a han dle on the wheel of the upper blind, essentially as and for the purpose set forth,

In testimonyT whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MAX BERGER.

Vitnesses PAUL KRGER, FRITZ SANDER. 

